package test27;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: ws
 * Date: 2023-04-19
 * Time: 11:17
 */
import java.util.*;
import java.math.*;

public class Main1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            String a = scanner.next();
            String b = scanner.next();
            String c = scanner.next();
            BigInteger aa = new BigInteger(a);
            BigInteger bb = new BigInteger(b);
            BigInteger cc = new BigInteger(c);
            if (aa.add(bb).compareTo(cc) > 0 && aa.add(cc).compareTo(bb) > 0 && bb.add(cc).compareTo(aa) > 0) {
                System.out.println("Yes");
            } else {
                System.out.println("No");
            }
        }
    }
}
